Big front-end designs are bad, because they do not match the reality. The devils are really in the details. However, the cost of changes is considered too high and the illusion of predictability makes us close our eyes on reality.
In Scrum we say that we should focus on infrastructure and architecture in the first Sprints. Decisions about our software development environment, tools and architectures are not easily reversible. The situation is much worse in the construction business. If we are building a bridge or a tower of Eiffel we can’t start it again from the beginning if the base is not strong enough.
The case is not that bad in software development. We use software instead of electronic circuits just because it is easier to change software than hardware.We need to have appropriate engineering practices to change Kent Beck’s famous cost curve. Extreme programming contains many practices that are needed to make the code easy to change. In addition to these we need solid architectural principles and rigorous attitude to quality.PowerPoint architectures outlined at the first Sprints are not good enough. We need executable architectures and extensive testing with highest priory business functionality to make sure that the quality attributes, non-functional requirements, are OK, before we continue deeper.We don’t stop to that. We require that the architectures are easy to change. Ease of refactoring and testing can be achieved with known design patterns.
My colleague has written a provocative blog entry about the current situation of agility.Actually, we are promoting our new course: Agile Engineering Practices, which can be used as a part of Certified Scrum Developer curriculum.
I found a revealing discussion at a popular suomi24.fi-site titled Ketterä IT-helvetti (agile IT hell ). It is amazing how often daily Scrum is practiced just opposite of Scrum’s basic idea of a self-organizing team.
This 15 minutes is just for the developers to say hello to each other and coordinate days activities. They need to know the situation after yesterday’s work because software development is not predictable. Sometimes tasks estimated to take 2 days take 5 days and sometimes they are ready after one day. So everyone needs to know where the team is and agree on what to do next.
The metaphor of chickens and pigs is meant to make sure that managers do not use that for micromanaging the people. Command and control is bad because it destroys peoples’ natural work motivation. People including developers want to achieve something and autonomy to do it – not that they are given orders and controlled tightly. Command and control reduces productivity and creativity which is really harmful in an art like software development. Psychological studies have shown that time after another.
Pair programming can be done in a way that does not decrease the motivation. As the code is owned by team and every team member is responsible of changing any peace of it the team needs a way to teach the secrets of the code modules to everyone in the team. That is pair programming. It prevents harmful specialization and at the same time decreases the number of errors in the code. Your pair is not watching and controlling what you are programming but you two work together to create great software. Two creative minds coding and discussing together is a way to learn from each other and do a great work. Pairs are changed normally on daily basis so that different angles on the problem can be thought. Pair programming should not be a stressful situation like the one described in suomi24. The team should discuss about the situation in its retrospective and decide how to continue to find the the joy of work that agility gives when it is practiced at its best.